/* roulang page: index */
:root {
      --primary-deep: #1A1F36;
      --accent-gold: #C5A86D;
      --bg-warm: #FAF9F6;
      --text-body: #2C2C2C;
      --text-heading: #1A1F36;
      --bright-gold: #D4AF37;
      --card-white: #FFFFFF;
      --border-light: #e8e6e1;
      --shadow-sm: 0 4px 20px rgba(26,31,54,0.06);
      --shadow-hover: 0 8px 30px rgba(26,31,54,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.9;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3, h4, .font-serif {
      font-family: var(--font-serif);
      color: var(--text-heading);
      font-weight: 600;
      letter-spacing: 0.02em;
    }
    
    h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.3;
    }
    
    h2 {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 1.5rem;
      position: relative;
      display: inline-block;
    }
    
    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 3px;
      background: var(--accent-gold);
    }
    
    h3 {
      font-size: 22px;
      font-weight: 600;
    }
    
    h4 {
      font-size: 18px;
      font-weight: 600;
      color: var(--primary-deep);
    }
    
    .text-gold {
      color: var(--accent-gold);
    }
    
    .bg-deep {
      background-color: var(--primary-deep);
    }
    
    .bg-warm {
      background-color: var(--bg-warm);
    }
    
    .btn-primary-custom {
      background-color: var(--accent-gold);
      border: none;
      color: var(--primary-deep);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: all 0.3s ease;
      letter-spacing: 0.5px;
      font-family: var(--font-sans);
      box-shadow: 0 4px 12px rgba(197,168,109,0.3);
    }
    
    .btn-primary-custom:hover {
      background-color: var(--bright-gold);
      color: #0f1322;
      transform: scale(1.02);
      box-shadow: 0 8px 20px rgba(212,175,55,0.4);
    }
    
    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--primary-deep);
      color: var(--primary-deep);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: all 0.3s ease;
      font-family: var(--font-sans);
    }
    
    .btn-outline-custom:hover {
      background-color: rgba(197,168,109,0.15);
      border-color: var(--accent-gold);
      color: #0f1322;
    }
    
    .card-custom {
      background: var(--card-white);
      border: none;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      height: 100%;
      border-left: 4px solid transparent;
    }
    
    .card-custom:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-left-color: var(--accent-gold);
    }
    
    /* 导航样式 */
    .navbar-custom {
      background: rgba(26,31,54,0.97);
      backdrop-filter: blur(10px);
      padding: 0;
      transition: all 0.3s;
      border-bottom: 1px solid rgba(197,168,109,0.4);
    }
    
    .navbar-brand {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--accent-gold) !important;
      letter-spacing: 2px;
    }
    
    .nav-link {
      color: #e0ddd5 !important;
      font-weight: 500;
      margin: 0 0.5rem;
      transition: 0.2s;
      font-size: 0.95rem;
    }
    
    .nav-link:hover, .nav-link.active {
      color: var(--bright-gold) !important;
    }
    
    .hot-tag {
      background: rgba(212,175,55,0.2);
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      font-size: 0.8rem;
      color: var(--bright-gold);
      margin-left: 0.3rem;
    }
    
    /* Hero区域 */
    .hero-section {
      background: linear-gradient(135deg, #1A1F36 0%, #2a2f4a 100%);
      padding: 120px 0 100px;
      position: relative;
      overflow: hidden;
    }
    
    .hero-section::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(circle at 30% 40%, rgba(197,168,109,0.08) 0%, transparent 50%);
    }
    
    .hero-img {
      max-height: 420px;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      border: 1px solid rgba(197,168,109,0.3);
    }
    
    /* 亮点网格不规则 */
    .grid-highlight {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    .grid-item {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px 20px;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
      border-left: 5px solid var(--accent-gold);
    }
    
    .grid-item:nth-child(2) {
      grid-row: span 2;
    }
    .grid-item:nth-child(4) {
      grid-row: span 2;
    }
    
    /* 案例瀑布流 */
    .masonry-cases {
      column-count: 3;
      column-gap: 24px;
    }
    
    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
      border: 1px solid transparent;
    }
    
    .case-card:hover {
      box-shadow: var(--shadow-hover);
      border-color: var(--accent-gold);
    }
    
    .case-card img {
      width: 100%;
      display: block;
      transition: transform 0.4s;
    }
    
    .case-card:hover img {
      transform: scale(1.03);
    }
    
    /* 方案对比表 */
    .compare-table th {
      background: var(--primary-deep);
      color: var(--accent-gold);
      font-weight: 600;
    }
    
    .highlight-row {
      background-color: rgba(197,168,109,0.08);
    }
    
    /* FAQ手风琴 */
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--primary-deep);
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: var(--accent-gold);
      box-shadow: 0 0 0 0.2rem rgba(197,168,109,0.25);
    }
    .accordion-item {
      border-left: 4px solid transparent;
      transition: 0.2s;
    }
    .accordion-item:hover {
      border-left-color: var(--accent-gold);
    }
    
    /* 页脚 */
    .footer a {
      color: #ccc6b8;
      text-decoration: none;
      transition: 0.2s;
    }
    .footer a:hover {
      color: var(--bright-gold);
    }
    
    @media (max-width: 992px) {
      h1 { font-size: 38px; }
      .grid-highlight { grid-template-columns: repeat(2,1fr); }
      .masonry-cases { column-count: 2; }
    }
    
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      .grid-highlight { grid-template-columns: 1fr; }
      .masonry-cases { column-count: 1; }
      .navbar-collapse { background: rgba(26,31,54,0.98); padding: 1rem; }
    }